The COSMOS HST/ACS Observations: A Public Legacy

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The Cosmic Evolution Survey (COSMOS) is the largest contiguous imaging project ever undertaken with the Hubble Space Telescope (HST), using the Advanced Camera for Surveys (ACS) to image a 2 square degree low-background equatorial field in 600 orbits with the F814W (I-band) filter. The principal goal of the project is to probe the formation and evolution of structures with size scales from galaxies to Coma-size clusters during the peak period of star formation and galaxy activity (redshifts 0.5 - 3). I summarize here the observational design of the HST/ACS observations, together with the processing and analysis techniques, and describe the rich public archival treasure trove of data that is now being produced from this survey. Combined with a wealth of ancillary datasets from X-ray through to radio wavelengths, this ACS survey is becoming a truly unique Hubble legacy for understanding the evolution of the visible and dark universe.

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